Generally yes.
But the main difference is that earbuds do not create a seal, while IEMs do.
Generally yes.
But the main difference is that earbuds do not create a seal, while IEMs do.
You don't need to. Normally there is no detectable difference.
It is worth a try, however, to see if there are no "enhancements" enabled somewhere (audio settings, some software suite), which might be doing something funny to sound. Exclusive mode will bypass all of that.
They're pretty bad. I don't think you can salvage the sound even with EQ.
No, you're totally fine with K3. Getting Schiit won't make any difference.
I mean, it should not do that, but is it really a normal use case to plug in a live barrel jack to the amp? First plug in the jack, then plug in the power adapter... Also, is the amp switched on when you plug it it?
They don't.
Custom cables are for the looks and/or convenience.
I always disliked this feature on Spotify. I can swear that it messed up dynamic range in the songs somehow, because with this setting on, parts of the song just sounded... wrong. That said, the last time I used it was probably 2 years ago.
Replay gain is great when implemented properly. But at least then, Normalize was kind of borked on Spotify.